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CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (PARENTHETICAL) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Temporary equity, authorized (in shares)   764,600,000
Temporary equity, issued (in shares)   734,142,041
Temporary equity outstanding (in shares)   734,142,041
Aggregate Liquidation Preference   $ 1,781,762
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock authorized (in shares) 100,000,000 0
Preferred stock, shares issued (in shares) 0 0
Preferred stock, outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock authorized (in shares) 2,800,000,000 1,150,000,000
Common stock, shares issued (in shares) 283,723,897 36,686,819
Common stock, shares outstanding (in shares) 282,103,259 36,504,319
Common stock, unvested subject to repurchase (in shares) 23,446 662,000
Treasury stock, shares (in shares) 1,620,638 182,500
Series A Preferred Stock    
Temporary equity, par or stated value per share (in shares) $ 0.001 $ 0.001
Temporary equity, authorized (in shares) 0 490,000,000
Temporary equity, issued (in shares) 0 485,795,293
Temporary equity outstanding (in shares) 0 485,795,293
Aggregate Liquidation Preference   $ 296,335
Series B Preferred Stock    
Temporary equity, par or stated value per share (in shares) $ 0.001 $ 0.001
Temporary equity, authorized (in shares) 0 30,000,000
Temporary equity, issued (in shares) 0 29,629,630
Temporary equity outstanding (in shares) 0 29,629,630
Aggregate Liquidation Preference   $ 16,000
Series C Preferred Stock    
Temporary equity, par or stated value per share (in shares) $ 0.001 $ 0.001
Temporary equity, authorized (in shares) 0 142,000,000
Temporary equity, issued (in shares) 0 116,200,835
Temporary equity outstanding (in shares) 0 116,200,835
Aggregate Liquidation Preference   $ 408,715
Series D Preferred Stock    
Temporary equity, par or stated value per share (in shares) $ 0.001 $ 0.001
Temporary equity, authorized (in shares) 0 102,600,000
Temporary equity, issued (in shares) 0 102,516,283
Temporary equity outstanding (in shares) 0 102,516,283
Aggregate Liquidation Preference   $ 1,060,712